基于 ACTRAN 的结构振动声辐射故障检测

摘要

This paper first introduces the dynamic equation of fluid-solid coupling,followed by numerical simu-lation using ACTRAN software on the vibration of the cable structure acoustic radiation problem.Finite element method is used to define different monitoring loading infinity and analyze the relationship between the sound ra-diation and vibration amplitude.Results show that vibration and sound radiation has a proportional relationship, namely when the vibration is severe,the sound pressure of the corresponding mechanical parts is high;when the vibration is small,the corresponding sound pressure is low.Furthermore,a cracked structure presents high vi-bration amplitude and the sound pressure value is higher than the healthy structure.This study provides the the-oretical foundation for the intelligent fault diagnosis of mechanical equipment research using acoustical signals.%文章对随机激励下结构振动声辐射问题进行研究，利用 ACTRAN 软件对简单结构体的振动声辐射问题进行了系统的分析，运用有限元－无限元方法对不同监测点进行定义加载，分析了声辐射声压与振动幅值的关系，同时，利用实验进行分析验证。结果证明：随着激励频率的增大，结构体振动幅值与声辐射声压值变化呈正相关关系，即激振频率越大，振动幅值与声压值的变化也变大。同时，有裂纹的结构体裂纹处的振动幅值与声压值比正常结构体变化非常明显，从而为运用振动与声学进行机械设备非接触故障诊断的研究提供了新的方法。